# SDR CALA2026061517083

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: June 11, 2026
- Submitted: June 15, 2026
- Operation: Air carrier
- Aircraft: [N27304](https://openairdocs.org/aircraft/N27304), registered now
- Make and model: Boeing 737-8
- Registry model: [Boeing 737-8](https://openairdocs.org/model/boeing-737-8) (OpenAirDocs)
- Aircraft serial: 67562
- Aircraft time: 10,699 hours, 3,724 cycles
- System (JASC): [3610 · Pneumatic Distribution System](https://openairdocs.org/jasc/3610)
- Part: Anti-Ice System
- Part number: 51090322002
- Part serial: 2887
- Condition: Faulted
- Part time: 10,691 hours, 3,720 cycles
- Stage of operation: CR
- How discovered: O
- Nature of condition: J
- Precautionary procedure: A
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/CALA2026061517083

## Discrepancy

BLEED CTRL ICING INHIB L INHIBIT FUNCTION FROM THE AIR SUPPLY CONTROLLER (ASC) TO ENGINE ANTI ICE (EAI) SYSTEM HAS FAILED.FROM AHM: ENGINE-1 INTERMEDIATE DUCT PRESSURE SENSOR SIGNAL IS OUT OF RANGE DETECTED BY: INTEGRATED AIR SYSTEMS CONTROLLER (IASC)-LEFT.  1AE. L ENGINE HP VLV IS SECURED CLOSED.   MAINTENANCE MESSAGE : 36-21010. INITIAL EVAL MAINTENANCE MESSAGE OCCURED DURING THE CLIMB FLIGHT PHASE. REF FIM 36-21 TASK 801 STEP D (1) FAULT ISOLATION PROCEDURE (CLIMB) REPLACE PRESSURE REGULATION SHUTOFF VALVE. PART NIS GUM. ENG 1 PRSOV REPLACED REF L/P 9218750. ENG 1 HPSOV REACTIVATED REF AMM 36-00-00-440-803. FAULT MSG 36-11020 'ENG 1 HPSOV NOT IN COMMANDED POSITION' IS LATCHED. NO OTHER FAULTS PRESENT. REQUIRES PNEUMATIC ENGINE ON- SYSTEM TEST REF FIM 36-11 TASK 802. REPLACED E1 HPSOV REF AMM 36-11-07. INSTALL LEAK CHECK GOOD. LRU REPLACEMENT TEST AND PNUEMATIC ENGINE ON SYSTEM TEST FAILED. NO HELP. FAULT REMAINED.

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